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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 606302.0, MPI für Astronomie / Publikationen_mpia
Absorption spectroscopy of astrophysically relevant molecules in supersonic jets
Authors:Huisken, F.; Rouillé, G.; Carpentier, Y.; Steglich, M.; Henning, T.
Date of Publication (YYYY-MM-DD):2012
Title of Proceedings:27th International Symposium on Rarefied Gas Dynamics
Start Page:819
End Page:824
Volume (in Series):1333
Name of Conference/Meeting:27th International Symposium on Rarefied Gas Dynamics
Audience:Not Specified
Abstract / Description:The jet-cooled ultraviolet absorption spectra of various polycyclic aromatic hydrocarbons (PAHs) have been measured by cavity ring-down laser absorption spectroscopy. The number of aromatic rings in the molecules studied varied from three (anthracene and phenanthrene) to six (benzo[g,h,i]perylene). None of the spectra comply with astronomical observations. In order to derive maximum column densities of the respective molecules in the astrophysical objects, their oscillator strengths have been determined by comparing the jet spectra with Ne matrix spectra also measured in our laboratory and with calibrated solution spectra. The paper gives an overview of the electronic spectra measured so far in our group, discusses a typical example (perylene) and some pecularities of PAH spectra, describes the procedure how the jet spectra can be calibrated to present absolute absorption cross sections, and concludes with a perspective for finding specific PAHs in interstellar and circumstellar clouds.
Free Keywords:diffusion; supersonic flow; interstellar matter; spectra; Viscosity; diffusion; and thermal conductivity; Supersonic and hypersonic flows; Physical properties; Visible and ultraviolet spectra
Comment of the Author/Creator:Date: 2012, May 1, 2011
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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